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Facebook's stock price slide has raised doubts about Mark Zuckerberg's role as CEO. Some say he should hand the reins to a more seasoned executive. The deepening slide in  Facebook Inc.'s stock is fueling talk once considered implausible on Wall Street and in Silicon Valley.

Facebook's stock plunged to a new low Thursday after the expiration of a ban that had prevented some early investors and insiders from dumping millions of additional shares they own in the social-networking leader.

Four years ago, then-Sen. Barack Obama got a head start on Arizona Sen. John McCain when it came to reaching voters online, on their mobile phones and on social media. Young voters, the group most likely to tune in digitally to the presidential campaign, broke overwhelmingly for Obama, giving him the biggest margin of victory among that age group ever recorded....

Facebook's early investors and a handful of directors will become eligible on Thursday to sell stock they own in the social networking company. It marks the beginning of a time-honored process for public companies, one that will give many Facebook employees the same right to sell their shares this fall.

The Federal Trade Commission voted Friday to finalize its settlement with Facebook, resolving charges that the social network exposed details about users' lives without getting the required legal consent.

Kevin Systrom's smartest move was to sell Instagram to Facebook early, before having to deliver even an iota of revenue. My prediction is that we’ll look back on Facebook's acquisition of Instagram as a bust—much in the same way we now view News Corp.’s purchase of Myspace, AOL’s purchase of Bebo, and Excite@Home’s purchase of Blue Mountain Arts.

...There’s also the issue that these mobile ads are completely new. Users don’t know any better and happen to click on them. However, over time (and probably pretty quickly), they will learn to avoid these new ads. When banner ads began in the 1990s, CTRs over 5% were common. They are currently 0.2 – 0.3%.

Facebook’s stock price reached a new low Thursday as shares of the world's largest social network fell below $20 for the first time, down by nearly half from its $38 initial public offering price.